Seventeen countries are hosting sites for the Phase 3 efficacy trials of a monthly PrEP pill, MK-8527, being developed by Merck (also known as MSD outside of the US and Canada). Merck announced the launch of the Phase 3 trials at IAS 2025 in Kigali. MK-8527 was found to be safe and well-tolerated in Phase 2 clinical trials.
EXPrESSIVE Phase 3 Trials Countries of MK-8527
Source of Lenacapavir for PrEP Supply to Early Adopter Countries
The Global Fund, with support from CIFF, and PEPFAR have jointly committed to reaching up to two million people with injectable lenacapavir for PrEP over three years. Supply of LEN is due to begin arriving in countries in late 2025 with service delivery planned to start in early 2026.
Source of Programmatic Cabotegravir for PrEP Supply
The first supplies of injectable cabotegravir for programmatic use (as opposed to use in implementation studies) began to arrive in countries in 2024. Currently, 16 countries are rolling out CAB for programmatic use, with the majority of supply provided by PEPFAR, and some additional quantities procured by the Global Fund.
Lenacapavir Implementation Studies
Ongoing and planned implementation studies for the lenacapavir as of October 2025. For product approvals, volumes, implementation, and price comparisons of long-acting PrEP, visit our dashboard on PrEPWatch.org.
Years Ahead in HIV Prevention Research: Time to Market
This timeline shows the potential time points when the next-generation of HIV prevention options might find their way into new programs.
Long-Acting PrEP: Priority Slides
Slides with the current status and proposed priorities for long-acting PrEP products, regulatory approvals, planning & budgeting, delivery, and much more. PDF and PPT versions available above. For slide 1, current status, click here. Slide 2, proposed priorities, is also available.
For product approvals, volumes, implementation, and price comparisons of long-acting PrEP, visit our dashboard on PrEPWatch.org.
Cabotegravir Implementation
Implementation studies completed, ongoing, or planned for cabotegravir as of October 2025. For product approvals, volumes, implementation, and price comparisons of long-acting PrEP, visit our dashboard on PrEPWatch.org.
Dapivirine Vaginal Ring Implementation
Ongoing and planned implementation studies for the dapivirine vaginal ring as of October 2025. For product approvals, volumes, implementation, and price comparisons of long-acting PrEP, visit our dashboard on PrEPWatch.org.
Cabotegravir Volume
Allocation of non-commercial cabotegravir for PrEP supply in low- and middle-income countries, 2023-2026, as of October 2025. For product approvals, volumes, implementation, and price comparisons of long-acting PrEP, visit our dashboard on PrEPWatch.org.
Dapivirine Vaginal Ring Volume
DVR supply available to low- and middle-income countries as of October 2025. For product approvals, volumes, implementation, and price comparisons of long-acting PrEP, visit our dashboard on PrEPWatch.org.